Transient Eddy Current in Magnet Structure Members

A computer program was developed to model transient eddy current in thin connected plates. Eddy current is deduced from the solution of an equivalent-network problem. Loop currents are introduced by a transformation as the unknown variables of the network equations (Kirchoff's laws). The network equations are solved numerically by the Runge-Kutta method. This program is quite efficient, allows for holes and multiple materials, and has built-in rotational symmetry options. In cases with known solutions, the model has been checked for both spatial and temporal profiles of the eddy current. Results are given for eddy-current profile and eddy-current loss in the magnet case, support plate, and several other magnet structure members.